Electric vehicles are taking the world by storm and unleashing the potential of lithium ion batteries, which were previously used primarily in mobile phones and laptops. While these batteries are now available on a broader scale for various energy storage applications, conventional lithium ion batteries will soon hit a plateau, and researchers are striving to break the conventional limits of energy density (volumetric and gravimetric), power, charging time, cycle life, temperature, safety and cost. Safety is one of the greatest concerns for electric vehicles, especially since improvements tend to come at the expense of power and charging time. The solid-state battery (SSB), often referred to as the holy grail of batteries, may have the potential to resolve these issues. Many companies, from startups, like Quantumscape, SES, Solid Power, Factorial Energy, and Cuberg, to the incumbent battery manufacturers and OEMs, like Toyota, Samsung SDI, Panasonic, and CATL, are working on different types of solid state batteries, as are many academic institutions and government labs. Currently, our research group has been active in developing new solid electrolytes for lithium solid-state batteries with good characteristics in terms of conductivity, Li transfer number, electrochemical properties, safety, friendly and low cost compared to commercial lithium ion batteries based on liquid electrolytes.